Effect of TiB2 on dry-sliding tribological properties of TiAl intermetallics

The dry-sliding tribological behaviors of Ti–46Al–2Cr–2Nb intermetallics and its composites with 20 and 40 vol% in situ formed TiB2 produced by hot press sintering process were investigated. Also, the microstructures and mechanical properties of the three materials were examined. With the increase of TiB2 amount, the hardness and wear resistance ascended. The enhanced wear resistance can be attributed to the higher hardness and the load-carrying role of TiB2. The friction coefficient was irrespective of TiB2 content. The wear mechanism of the materials was dominated by fatigue wear and delamination.

► TiB2 enhanced significantly wear-resistance of the Ti–46Al–2Cr–2 Nb intermetallics.
► The friction coefficient of the materials is irrespective of TiB2 content.
► Wear resistance significantly increases with rising TiB2 amount.